Explain5 marksStandard
The enzyme catalase is found in many cells and catalyses the decomposition of hydrogen peroxide into water and oxygen. Explain why catalase catalyses only the decomposition of hydrogen peroxide and no other reactions.
CAIE A Level Biology 9700 · Enzymes
Enzymes: explain question
How this question is marked
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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